Build LLVM 14.0.6-1

[vchuravy]

Rebuild LLVM for JuliaLang/julia#48057

[giordano]

MSAN build is failing with

[09:01:17] CMake Error at /usr/share/cmake/Modules/CMakeTestCCompiler.cmake:69 (message):
[09:01:17]   The C compiler
[09:01:17] 
[09:01:17]     "/opt/bin/x86_64-linux-gnu-libgfortran4-cxx11-sanitize+memory/x86_64-linux-gnu-clang"
[09:01:17] 
[09:01:17]   is not able to compile a simple test program.
[09:01:17] 
[09:01:17]   It fails with the following output:
[09:01:17] 
[09:01:17]     Change Dir: /workspace/build/CMakeFiles/CMakeTmp
[09:01:17]     
[09:01:17]     Run Build Command(s):/usr/bin/ninja cmTC_bfc94 && [1/2] Building C object CMakeFiles/cmTC_bfc94.dir/testCCompiler.c.o
[09:01:17]     ninja: job failed: /opt/bin/x86_64-linux-gnu-libgfortran4-cxx11-sanitize+memory/x86_64-linux-gnu-clang --target=x86_64-linux-gnu --sysroot=/opt/x86_64-linux-gnu/x86_64-linux-gnu/sys-root/   -fno-gnu-unique -MD -MT CMakeFiles/cmTC_bfc94.dir/testCCompiler.c.o -MF CMakeFiles/cmTC_bfc94.dir/testCCompiler.c.o.d -o CMakeFiles/cmTC_bfc94.dir/testCCompiler.c.o -c /workspace/build/CMakeFiles/CMakeTmp/testCCompiler.c
[09:01:17]     clang-12: error: unknown argument: '-fno-gnu-unique'
[09:01:17]     ninja: subcommand failed
[09:01:17]     
[09:01:17]     
[09:01:17] 
[09:01:17]   
[09:01:17] 
[09:01:17]   CMake will not be able to correctly generate this project.
[09:01:17] Call Stack (most recent call first):
[09:01:17]   CMakeLists.txt:49 (project)

CC @gbaraldi. How did this work before?

[gbaraldi]

I'm not sure, that's an odd failure. It comes from the clang that we ship. Which I thought was clang14. I wonder if it's clang on linux issue and not a MSAN issue.

[giordano]

It's clang 13, but as far as I understand that's a GCC-only flag, so how are we getting it?

[gbaraldi]

It seems we are passing it to every compiler invocation, though I don't know who is passing it.

[gbaraldi]

Yggdrasil/L/LLVM/common.jl

Lines 163 to 166 in 064f152

	if [[ "${target}" == *linux* || "${target}" == *mingw* ]]; then
	# https://bugs.llvm.org/show_bug.cgi?id=48221
	CMAKE_CXX_FLAGS+="-fno-gnu-unique"
	fi

it comes from here. I don't think MSAN LLVM was ever built, I was just building it locally since it's fine.

[giordano]

[20:59:56] CMake Error at /usr/share/cmake/Modules/CMakeTestCCompiler.cmake:69 (message):
[20:59:56]   The C compiler
[20:59:56] 
[20:59:56]     "/opt/bin/x86_64-linux-gnu-libgfortran4-cxx11-sanitize+memory/x86_64-linux-gnu-clang"
[20:59:56] 
[20:59:56]   is not able to compile a simple test program.
[20:59:56] 
[20:59:56]   It fails with the following output:
[20:59:56] 
[20:59:56]     Change Dir: /workspace/build/CMakeFiles/CMakeTmp
[20:59:56]     
[20:59:56]     Run Build Command(s):/usr/bin/ninja cmTC_3ccb5 && [1/2] Building C object CMakeFiles/cmTC_3ccb5.dir/testCCompiler.c.o
[20:59:56]     [2/2] Linking C executable cmTC_3ccb5
[20:59:56]     ninja: job failed: : && /opt/bin/x86_64-linux-gnu-libgfortran4-cxx11-sanitize+memory/x86_64-linux-gnu-clang --target=x86_64-linux-gnu --sysroot=/opt/x86_64-linux-gnu/x86_64-linux-gnu/sys-root/   CMakeFiles/cmTC_3ccb5.dir/testCCompiler.c.o -o cmTC_3ccb5   && :
[20:59:56]     /opt/x86_64-linux-gnu/bin/x86_64-linux-gnu-ld: cannot find /opt/x86_64-linux-musl/lib/clang/12.0.0/lib/linux/libclang_rt.msan-x86_64.a: No such file or directory
[20:59:56]     clang-12: error: linker command failed with exit code 1 (use -v to see invocation)
[20:59:56]     ninja: subcommand failed
[20:59:56]     
[20:59:56]     
[20:59:56] 
[20:59:56]   
[20:59:56] 
[20:59:56]   CMake will not be able to correctly generate this project.
[20:59:56] Call Stack (most recent call first):
[20:59:56]   CMakeLists.txt:49 (project)

[giordano]

The MSAN build is thoroughly broken, I still don't understand how this ever worked.

[giordano]

MSAN was added in #5488, but that didn't trigger an actual build because it didn't edit a build_tarballs.jl file. @vchuravy any objections against reverting that PR, unless you're motivated to fix it?

[vchuravy]

Happy to revert.